[RTTY] TinyFSK modem for 45 and 75 baud

[Ed Muns]

EXTFSK produces timing jitter that can make the signal harder to decode,
depending on many aspects of a given situation, such as weak signal
strength, QRM, QSB, QRN, etc.  It works, just not as well as a proper
hardware UART solution.

Ed W0YK

Bill W6WRT wrote:
> I hadn't realized there was such a problem. I do have a more 
> or less conventional PC with a pair of PCI boards with com 
> ports so I don't use any USB to serial converters. May I ask 
> how this timing problem manifests itself over the air? Poor 
> weak signal reception? Or what?